Interesting that a similar pic is in a
Wikipedia article about Whipped-cream charger
I've never seen a pile of them like that laying around. I've occasionally seen a bunch of spent shotgun shells laying around next to their boxes like that in odd places. So I guess different people get their jollies different ways.
Just to be clear, they are all spent? Otherwise, what would be the harm in using N20 in your tires. Or does butyl rubber and/or latex not like exposure to Nitrous Oxide? To early for me to look that up. Hadn't had my coffee and some quick searches didn't say and others where too technical for my grade level.